Image Formation by Spherical Lenses

Q.

Choose the correct ray diagram?

Q. An object is placed at $90cm$ from the lens with the radius of curvature $40cm$. The central portion of a lens is wrapped in a black paper as shown below. How will the image change after wrapping the black paper?

1. The image formed will be diminished.

2. The intensity of the image formed will decrease.

3. Image will not be formed.

4. The intensity of the image formed will increase.

Q.

If AB is an object and A'B' is an image formed, then match the following.

1. 1 - A, 2 - C, 3 - A, 4 - B

2. 1 - D, 2 - C, 3 - A, 4 - B

3. 1 - A, 2 - C, 3 - B, 4 - D

4. 1 - C, 2 - A, 3 - A, 4 - B

Q.

Real, inverted and enlarged image will be formed in case of:

1. Concave lens, object placed between focus F & optical centre O.

2. Convex lens, object placed between $F_1$ and $2F_1$.

3. Concave mirror, object placed between pole & focus.

4. Convex lens, object placed beyond $2F_1$.

Q.

Identify the condition, which will form enlarged, virtual and erect image?

1. Convex lens, object placed between $F_1$ and 2$F_1$_.

2. Convex lens, object placed beyond 2$F_1$_.

3. Convex lens, object placed between $F_1$ and optical centre O.

4. Concave lens, object placed beyond centre of curvature.

Q.

An object is placed infront of a lens. If we cover the middle part of the lens, the intensity of the image formed will decrease.

1. False

2. True

Q.

Identify the condition in which image formed is real, inverted and diminished from the following.

1. Concave lens, object placed between focus and optical centre

2. Convex lens, object placed between $F_1$ and 2$F_1$

3. Concave mirror, object placed between centre of curvature and focus

4. Convex lens, object placed beyond 2$F_1$

Q.

Which mirror or lens can form a virtual, erect and highly diminished image of object?

1. convex mirror and convex lens

2. convex mirror and concave lens

3. concave mirror and concave lens

4. concave mirror and convex lens

Q. Where would the image form, if the object is placed at a finite distance from a concave lens?

1. At F
2. Between C and F
3. Between F and O
4. At O

Q.

A point on a thin lens, through which light ray passes without any deviation is called ______________.

1. centre of curvature

2. optical centre

3. second focus

4. focus